Chamberlain LiftMaster PREMIUM Series Manual page 22

Power
2
Ensure the Safety Reversing Sensors are aligned
The door will not close if the sensors
have not been installed and aligned
correctly.
When the light beam is obstructed or
misaligned while the door is closing, the
door will reverse and the garage door
opener lights will flash ten times. If the door
is already open, it will not close. The
sensors can be aligned by loosening the
wing nuts, aligning the sensors, and
tightening the wing nuts.
IF THE AMBER LED ON THE SENDING SENSOR IS NOT GLOWING:
Make sure there is Make sure the
power to the garage sensor wire is not
door opener. shorted/broken.
3
Ensure the Door Control is wired correctly
If the door control has been installed and wired correctly, the command LED behind the push bar will blink.
2.1
Check to make sure the LEDs in both sensors are glowing steadily. The LEDs in both sensors will glow steadily if they
are aligned and wired correctly.
Amber LED
E S N D N I G
Make sure the sensor has been wired
correctly: white wires to white terminal
and white/black wires to grey terminal.
If the receiving sensor is in
direct sunlight, switch it with
sending sensor so it is on the
opposite side of the door.
(invisible light beam)
E S N S O R E R E C V I N I G
IF THE GREEN LED ON THE RECEIVING SENSOR IS NOT GLOWING:
Make sure the sensor wire is Make sure the sensors are aligned.
not shorted/broken.
22
Green LED
E S N S O R